Dan Martin

Sounds good!

Triz08

you guys are making this much more complicated than it really is. If you never will consider putting the oem cat back on, just do it the easy way and spend 160 and get yourself a high-flow cat at any muffler shop.

If you really want to keep the stock cat, then just keep the cat after they cut it off, and later on if you want it back on, just cut off the highflow cat and put the oem back on.

Noise will be increased a little with a highflow cat, a bit deeper but louder. Its easier to hear at lower rpms than before. But in the case of a testpipe/resonator, im sure it will make it alot louder, maybe even a bit raspy.

IMO i feel the gains were worth the money. Especially now, how the header and high flow cat completely fixed the hesitation i used to feel at vtec with hondata. Acceleration is alot smoother and consistant now. On the downside, i do think my gas mileage has decreased somewhat from adding this cat. I havent done any factual tests yet, but ive been noticing my tsx eating up more gas quicker than before.

dzuy

let vwong do it!!!

he's about 30 min from the oc and he has hondata!!!!

Dan Martin

If it cost you $160 and this set is $175, don't you think it's worth $15 so you can have the flexibilty of changing cats without having to go to a shop?

When I sell a car I generally don't want to sell it with a double hacked up OEM component. It's just begging to set off alarm bells at the mechanic when it goes in for inspection.

I'm still looking forward to this mod, it sounds like a cost effective upgrade with good results.

dzuy

i'm interested as well. i would rather have the option of putting my stock cat back on as well.

jonnerd154

put me down for a high flow cat

dzuy

mrheeltoe,

i'm about this close [holds two fingers close together] from just buying the cat from you.

still want more details.

1. what pn cat are you using?
2. pics.

and believe you me, i will be revisiting the track w/ this mod.

MrHeeltoe

iTrader: (1)

DUDE, slow down a little...I am not sure why you think this is even a done deal yet.....I have not made these! I am not even starting until next week. Nothing for you to look at yet.

dzuy

i know. i'm just letting you know i want to see pics

JTso

iTrader: (2)

dzuy next post is going to be (in big fonts) - "I will buy you MrHeeltoe!!! sell me your cat!!!"

vwong

dzuy

:troutslap <- Jt SLOW

dzuy

did someone break ground yet?



i'm waiting

JTso

iTrader: (2)

I already have the rear flange, gasket, extension pipe and cat ready. Just bought a pipe cutter today to make the final cut on the extension. Picking up the front flange tomorrow after work from my welding instructor, who offered to mill out the center hole for me (the hardest part without a machine shop). Just about to remove the cat off my car for some final measurements. With any luck, I will have one installed by the end of this week.

dzuy

:troutslap

i meant mr heel toe hahaha.

hey if you get measurements, can you send them my way thru pm?

thanks buddy.

will we see 14 sec slips from you? (or me?)

Tsx536

Can't wait to see pics/results

Dan Martin

Nice going Johnny!

JTso

iTrader: (2)

Didn't I pm you with the info already? :troutslap The OAL is 17-3/4". However, I would make it 18" instead, as it seems to need the extra length to relieve the stress on the rubber hangers downstream of the exhaust system.

I will see what kind of result on the dyno first before hitting the track.

drkangel348

This is exactly what I wanted to hear!
My next mod? High flow cat.

N_Smith

Most CA shops won't even touch the cat....

Is there a direct replacement coming anytime soon, or are we stuck with universal?

drkangel348

I got my high flow cat installed on Friday, thanks rmpage!
Heres a thread I made about it with pictures.

JTso

iTrader: (2)

Here is my high flow cat with the O2 sensor at the factory location. It has true 2.25" ID in/out at the flanges. However, the header collector and stock catback are still only 2.00" ID. My next plan is to cut off the header collector at the 2 into 1 section, and weld on a new section with a matching flex pipe with the same 2.25" ID, and later follow by a new catback system.

rmpage

Did you run into any problems putting the secondary O2 sensor bung into the catalyst section?

JTso

iTrader: (2)

No problems at all with the O2 sensor as it's designed just like the stock cat. However, I did have to rotate the cat slightly to point the O2 bung sideway. I didn't know the bung was pointing at an angle, and I didn't want to buy a new cat.

rmpage

Well it looks sweet. So yours came with a bung welded in it already? Did you notice a performance difference?

Also, I think I'm going to grab a set of calipers and get the ID of the Comptech downpipe and Fujitsubo catback. They looked like 2.5" last I checked but probably aren't. I'm also curious to see what you decide to do about the catback.

TinkySD

it's not a jtso mod without a dyno...let's have it!

MrHeeltoe

iTrader: (1)

Carsound is coing out with a new cat that we want to use....so, stay tuned!

JTso

iTrader: (2)

I was going to dyno it today but the dyno is all booked up. Will try again soon, perhaps with the header collector re-sized.

JTso

iTrader: (2)

I used Magnaflow 54055 which comes with the O2 bung, but the universal one should work just fine as well. The cat inlet/outlet is 2.25. But the extension pipe that I used is 2.5" OD with a 2.25" ID. One end of the pipe is expanded slightly to slip over the cat outlet to maintain the true 2.25" ID. It's a pretty thick pipe to keep any rattle/raspy sound down. The rear flange is also a 2.5" ID which is perfect for the extension pipe.

This is just a prototype cat to see what works. I'd be interested to see the new cat that MrHeeltoe mentioned and perhaps just buy one the next time.

Tsx536

Thanks for the update JTso. The cat looks great!

Did you come with a heat shield or did you get that custom done?
Did this new high flow cat make your exhuast louder?

JTso

iTrader: (2)

The cat came with a top heat shield but no bottom. I don't believe it made the stock exhaust louder, but the engine does seem more rev happy with the cat. The intake is still louder.

rmpage

I notice that's an OBD2 compliant cat. The one I used wasn't. I wonder what the differences are, whether it's just the sensor bung placement, or if the catalyst is different?

MrHeeltoe

iTrader: (1)

I think it is the sticker on the box that is different, That is my theory. I think it is a conspiricy....

JTso

iTrader: (2)

I think the difference is just the O2 bung, as OBD1 does not require the secondary O2 sensor. You can make the universal cat OBD2 compliant by adding an O2 bung at the end, like what you have already done.

dzuy

this thread is worthless w/o dyno or 1/4 mile time slips.

JTso

iTrader: (2)

So dzuy, what are you waiting for?

sauceman

Nice avatar dzuy!

dzuy

i was waiting for mr heel toe to release his cat.

actually, i've been thinking alot about cars and modifying, and it's so much money.

i've spent so much money on buying "quality: products - comptech exhaust components, tein suspension....

is it really worth it?

i guess it's a little too late in the game i guess - i've spent so much already.

but still...so the cat is gonna cost a couple hundred bucks - but to be honest, i could enjoy the couple hundred bucks elsewhere.

we'll see.

i always try to resist the car urge.

:troutslap

dzuy

i know! i love it!!!

but i still dont know how it changed?!?!

:troutslap <- dzuy

Bill Hook

http://userwww.sfsu.edu/~ecg/index.htm